diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 29b365a..91bb9a9 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -960,10 +960,37 @@
 	nr_ioapics++;
 }
 
+static void assign_to_mp_irq(struct mp_config_intsrc *m,
+				    struct mp_config_intsrc *mp_irq)
+{
+	memcpy(mp_irq, m, sizeof(struct mp_config_intsrc));
+}
+
+static int mp_irq_cmp(struct mp_config_intsrc *mp_irq,
+				struct mp_config_intsrc *m)
+{
+	return memcmp(mp_irq, m, sizeof(struct mp_config_intsrc));
+}
+
+static void save_mp_irq(struct mp_config_intsrc *m)
+{
+	int i;
+
+	for (i = 0; i < mp_irq_entries; i++) {
+		if (!mp_irq_cmp(&mp_irqs[i], m))
+			return;
+	}
+
+	assign_to_mp_irq(m, &mp_irqs[mp_irq_entries]);
+	if (++mp_irq_entries == MAX_IRQ_SOURCES)
+		panic("Max # of irq sources exceeded!!\n");
+}
+
 void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, u32 gsi)
 {
 	int ioapic;
 	int pin;
+	struct mp_config_intsrc mp_irq;
 
 	/*
 	 * Convert 'gsi' to 'ioapic.pin'.
@@ -981,18 +1008,15 @@
 	if ((bus_irq == 0) && (trigger == 3))
 		trigger = 1;
 
-	mp_irqs[mp_irq_entries].mp_type = MP_INTSRC;
-	mp_irqs[mp_irq_entries].mp_irqtype = mp_INT;
-	mp_irqs[mp_irq_entries].mp_irqflag = (trigger << 2) | polarity;
-	mp_irqs[mp_irq_entries].mp_srcbus = MP_ISA_BUS;
-	mp_irqs[mp_irq_entries].mp_srcbusirq = bus_irq;	/* IRQ */
-	mp_irqs[mp_irq_entries].mp_dstapic =
-			mp_ioapics[ioapic].mp_apicid;	/* APIC ID */
-	mp_irqs[mp_irq_entries].mp_dstirq = pin;	/* INTIN# */
+	mp_irq.mp_type = MP_INTSRC;
+	mp_irq.mp_irqtype = mp_INT;
+	mp_irq.mp_irqflag = (trigger << 2) | polarity;
+	mp_irq.mp_srcbus = MP_ISA_BUS;
+	mp_irq.mp_srcbusirq = bus_irq;	/* IRQ */
+	mp_irq.mp_dstapic = mp_ioapics[ioapic].mp_apicid; /* APIC ID */
+	mp_irq.mp_dstirq = pin;	/* INTIN# */
 
-	if (++mp_irq_entries == MAX_IRQ_SOURCES)
-		panic("Max # of irq sources exceeded!!\n");
-
+	save_mp_irq(&mp_irq);
 }
 
 void __init mp_config_acpi_legacy_irqs(void)
@@ -1000,6 +1024,7 @@
 	int i;
 	int ioapic;
 	unsigned int dstapic;
+	struct mp_config_intsrc mp_irq;
 
 #if defined (CONFIG_MCA) || defined (CONFIG_EISA)
 	/*
@@ -1052,16 +1077,15 @@
 			continue;	/* IRQ already used */
 		}
 
-		mp_irqs[mp_irq_entries].mp_type = MP_INTSRC;
-		mp_irqs[mp_irq_entries].mp_irqflag = 0;	/* Conforming */
-		mp_irqs[mp_irq_entries].mp_srcbus = MP_ISA_BUS;
-		mp_irqs[mp_irq_entries].mp_dstapic = dstapic;
-		mp_irqs[mp_irq_entries].mp_irqtype = mp_INT;
-		mp_irqs[mp_irq_entries].mp_srcbusirq = i; /* Identity mapped */
-		mp_irqs[mp_irq_entries].mp_dstirq = i;
+		mp_irq.mp_type = MP_INTSRC;
+		mp_irq.mp_irqflag = 0;	/* Conforming */
+		mp_irq.mp_srcbus = MP_ISA_BUS;
+		mp_irq.mp_dstapic = dstapic;
+		mp_irq.mp_irqtype = mp_INT;
+		mp_irq.mp_srcbusirq = i; /* Identity mapped */
+		mp_irq.mp_dstirq = i;
 
-		if (++mp_irq_entries == MAX_IRQ_SOURCES)
-			panic("Max # of irq sources exceeded!!\n");
+		save_mp_irq(&mp_irq);
 	}
 }
 
@@ -1169,25 +1193,26 @@
 int mp_config_acpi_gsi(unsigned char number, unsigned int devfn, u8 pin,
 			u32 gsi, int triggering, int polarity)
 {
-	struct mpc_config_intsrc intsrc;
+#ifdef CONFIG_X86_MPPARSE
+	struct mp_config_intsrc mp_irq;
 	int ioapic;
 
-	if (!enable_update_mptable)
+	if (!acpi_ioapic)
 		return 0;
 
 	/* print the entry should happen on mptable identically */
-	intsrc.mpc_type = MP_INTSRC;
-	intsrc.mpc_irqtype = mp_INT;
-	intsrc.mpc_irqflag = (triggering == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
+	mp_irq.mp_type = MP_INTSRC;
+	mp_irq.mp_irqtype = mp_INT;
+	mp_irq.mp_irqflag = (triggering == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
 				(polarity == ACPI_ACTIVE_HIGH ? 1 : 3);
-	intsrc.mpc_srcbus = number;
-	intsrc.mpc_srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
+	mp_irq.mp_srcbus = number;
+	mp_irq.mp_srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
 	ioapic = mp_find_ioapic(gsi);
-	intsrc.mpc_dstapic = mp_ioapic_routing[ioapic].apic_id;
-	intsrc.mpc_dstirq = gsi - mp_ioapic_routing[ioapic].gsi_base;
+	mp_irq.mp_dstapic = mp_ioapic_routing[ioapic].apic_id;
+	mp_irq.mp_dstirq = gsi - mp_ioapic_routing[ioapic].gsi_base;
 
-	MP_intsrc_info(&intsrc);
-
+	save_mp_irq(&mp_irq);
+#endif
 	return 0;
 }
 
diff --git a/arch/x86/kernel/mpparse.c b/arch/x86/kernel/mpparse.c
index 014ac5d..8b6b1e0 100644
--- a/arch/x86/kernel/mpparse.c
+++ b/arch/x86/kernel/mpparse.c
@@ -34,8 +34,6 @@
 #include <mach_mpparse.h>
 #endif
 
-int enable_update_mptable;
-
 /*
  * Checksum an MP configuration block.
  */
@@ -246,7 +244,7 @@
 		mp_irq->mp_srcbusirq, mp_irq->mp_dstapic, mp_irq->mp_dstirq);
 }
 
-static void assign_to_mp_irq(struct mpc_config_intsrc *m,
+static void __init assign_to_mp_irq(struct mpc_config_intsrc *m,
 				    struct mp_config_intsrc *mp_irq)
 {
 	mp_irq->mp_dstapic = m->mpc_dstapic;
@@ -270,7 +268,7 @@
 	m->mpc_dstirq = mp_irq->mp_dstirq;
 }
 
-static int mp_irq_mpc_intsrc_cmp(struct mp_config_intsrc *mp_irq,
+static int __init mp_irq_mpc_intsrc_cmp(struct mp_config_intsrc *mp_irq,
 					struct mpc_config_intsrc *m)
 {
 	if (mp_irq->mp_dstapic != m->mpc_dstapic)
@@ -291,17 +289,16 @@
 	return 0;
 }
 
-void MP_intsrc_info(struct mpc_config_intsrc *m)
+static void __init MP_intsrc_info(struct mpc_config_intsrc *m)
 {
 	int i;
 
 	print_MP_intsrc_info(m);
 
-	if (enable_update_mptable)
-		for (i = 0; i < mp_irq_entries; i++) {
-			if (!mp_irq_mpc_intsrc_cmp(&mp_irqs[i], m))
-				return;
-		}
+	for (i = 0; i < mp_irq_entries; i++) {
+		if (!mp_irq_mpc_intsrc_cmp(&mp_irqs[i], m))
+			return;
+	}
 
 	assign_to_mp_irq(m, &mp_irqs[mp_irq_entries]);
 	if (++mp_irq_entries == MAX_IRQ_SOURCES)
@@ -1113,6 +1110,8 @@
 	return 0;
 }
 
+static int __initdata enable_update_mptable;
+
 static int __init update_mptable_setup(char *str)
 {
 	enable_update_mptable = 1;